I made a stupid mistake in not looking closely enough at xorg log.
It seems that my comment in my xorg.conf was wrong, and that my "1400x1050j" did not work because 8174 thought the clock was too high.
"1400x1050h" was the one loading, for it's modeline was set to clock of 97.

I have still the problem of dot clock NOT being detected properly, so i made a new modeline that uses the 8174 "detected" maximum of 108.